<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    b页面
   <script>
       document.domain='http://localhost:1002';
       //获取父窗口window.parent的user参数
       console.log(window.parent.user);
       
   </script>
</body>
</html>